---- Minecraft Crash Report ----// On the bright side, I bought you a teddy bear!

Time: 17/05/13 23:28Description: Exception in server tick loop

java.lang.ArrayIndexOutOfBoundsException: -2 at net.minecraft.world.chunk.NibbleArray.func_76582_a(SourceFile:28) at net.minecraft.world.chunk.storage.ExtendedBlockStorage.func_76665_b(SourceFile:75) at net.minecraft.world.chunk.Chunk.func_76628_c(Chunk.java:548) at net.minecraft.world.chunk.Chunk.func_150812_a(Chunk.java:878) at net.minecraft.world.chunk.Chunk.func_150813_a(Chunk.java:862) at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadEntities(AnvilChunkLoader.java:500) at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:41) at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12) at net.minecraftforge.common.util.AsynchronousExecutor$Task.finish(AsynchronousExecutor.java:189) at net.minecraftforge.common.util.AsynchronousExecutor.finishActive(AsynchronousExecutor.java:354) at net.minecraftforge.common.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:30) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:596) at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------